A = (-0.187281120081856, 8.542574943315804)
B = (9.52370042835271, 8.649289026265635)
a = Segment(A, B)
b = OrthogonalLine(A, a)
D = Point(b)
c = OrthogonalLine(D, b)
C = Point(c)
đa giác1, a_1, b_1, d, X = Polygon(A, B, C, D)
α = Angle(C, D, A)
β = Angle(D, A, B)
e = Distance(d, a_1)